/Engine/Source/Runtime/AudioMixer/Public/AudioBusSubsystem.h
[Audio::FPatchOutputStrongPtr](API\Runtime\Engine\FPatchOutputStrongPtr) AddPatchOutputForAudioBus ( [Audio::FAudioBusKey](API\Runtime\AudioMixer\FAudioBusKey) InAudioBusKey, int32 InFrames, int32 InChannels, float InGain )